More than anything else, atheism is liberation: Liberation to reason, to think, and to determine what matters and what course you should take without religious fetters of expectation or its chains of guilt.

The best way for atheists to affect the world is to use that liberty to build the world we want for ourselves.

Principle's sound, but I think you're giving too many Christians too much credit for taking faith seriously. As often as not, a favorable afterlife is the final defense against the death they dread and avoid.